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Unravelling the role of vacancies in lead halide perovskite through electrical switching of photoluminescence

Title data

Li, Cheng ; Guerrero, Antonio ; Hüttner, Sven ; Bisquert, Juan:
Unravelling the role of vacancies in lead halide perovskite through electrical switching of photoluminescence.
In: Nature Communications. Vol. 9 (30 November 2018) Issue 1 . - No. 5113.
ISSN 2041-1723
DOI: https://doi.org/10.1038/s41467-018-07571-6

Abstract in another language

We address the behavior in which a bias voltage can be used to switch on and off the photoluminescence of a planar film of methylammonium lead triiodide perovskite (MAPbI3) semiconductor with lateral symmetric electrodes. It is observed that a dark region advances from the positive electrode at a slow velocity of order of 10 μm s–1. Here we explain the existence of the sharp front by a drift of ionic vacancies limited by local saturation, that induce defects and drastically reduce the radiative recombination rate in the film. The model accounts for the time dependence of electrical current due to the ion-induced doping modification, that changes local electron and hole concentration with the drift of vacancies. The analysis of current dependence on time leads to a direct determination of the diffusion coefficient of iodine vacancies and provides detailed information of ionic effects over the electrooptical properties of hybrid perovskite materials.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 27 Sep 2019 12:07
Last Modified: 27 Sep 2019 12:07
URI: https://eref.uni-bayreuth.de/id/eprint/52493